Davit structure.



W. C. SEERS & F. W. NEW.

DAVIT STRUCTURE.

APPLICATION HlED APR. 16. I918.

Patented Dec. 31-, 1918.

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WILLIAM G. SEERS AND FREDERICK W. NEW, 0F LOS GELES, CALIFORNIA.

V DAVIT STRUCTURE.

Specification of Letters Patent.

Patented Dec. 31, 1918.

Application filed April 16, 1918. Serial No. 228,966.

To all whom it may concern:

Be it known that we, WILLIAM C. SEERs, a subject of the King of Great Britain, and FREDERICK W. NEW, a citizen of the United States, both residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Davit Structures, of which the following is a specification.

This invention relates to a davit for hoisting and lowering objects over the side of a vessel and is especially adapted for use with life boats,'nets and the like. g It is an object of this invention to provide a structure by which the objects to be lowered may quickly be swung from the deck of the vessel and over the side thereof, and whereby it maybe maintained, while being lowered,'some distance'from the side of the boat to prevent injury by the object swinging and striking against the side .of the vessel. 7 1

' It is another object to provide a davit structure, which willpermit a life boat to be filled on the deck ofthe vessel with passengers, and then swung over the side thereof and lowered to the water.

In addition to the broader features of design, other objects of this invention are to provide details 'of structure, whereby simplicity and durability of construction as .well as ease and certainty of operation are secured.

We attain these objects by means of the embodiment of our invention illustrated-in the accompanying drawing, in which:

Figure 1 is a side elevation of a fragment of a vessel having our improved davit construction mounted thereon, the davit construction being shown in closed position. Fig. 2 is a side elevation of the construction shown in Fig. 1. Fig. 3 is a plan view of a mechanism for operating the davit struc ture. Fig. 4 is aside elevation showing the davit structure open and in its first position for lowering a boat. Fig. 5 is a side elevation showing the davit structure in the second position in lowering a boat. Fig. 6 shows the last position of the davit-structure. Fig. 7 is a plan View of the davit structure in the position shown in Fig. 6. Referring more particularly to the drawing a fragment of the side of a vessel is indicated conventionally by 9. Pivotally se- 10 and 11. Mounted upon the top of brackets 10 and 11 adjacent the free ends thereof is a tilting cradle 12. Suspended from the cradle 12 is a life boat 13. The brackets 10 and 11 are secured to th side of the vessel by tubular bearings 14 and 15. As these bearings are duplicates of each other only one will be described, namely, 14-. The tubular member 14 is slit longitudinally throughout its length as indicated by 16. Notches 17, 18 and 19 are formed therein and communicate with the slit 16. The notches are beveled for a purpose later described. Slidably and pivotally mounted within the tubular member 14: is a post 20. The bracket 10 has fingers 21, 22, and 23, which are disposed in the notches 17, 18 and 19 respectively and are secured to the post 20. It is evident that when the structure is in the position shown in Fig. lthe brackets 10 and 11. may be swung outwardly through 90 degrees-into the open position shown in Figs. 1 to 7 inclusive. When the brackets are in their open position, they may be moved 2 to slide axially of'the tubular members 14 and 15; the fingers 21,22 andl23 slidein the slit 16. The post 20 is made of such length with respect to thelength of the tubular member 14: that the bracket 10-. may move downwardly in the latter. When the fingers 21, 22 and 23 are out of registration with the notches 17 18 and 19, the bracket is held in open position.

Rotatably mounted upon the end of brackets 10 and 11 are supports 24: and 25. Mounted in the supports24 and 25 is a shaft 26 upon which the cradle 12 is journaled. The cradle 12 comprises end members 27 and 28 joined at the top by a cross member 29. The cradle 12 is journaled upon the shaft 26 at the lower ends of the cross members 27 and 28. Joined to the end members 27 and 28 adjacent the shaft 26 are rearwardly extending members 30 and 31, which are disposed at right angles to the aforesaid end members. A member 32 joins members 30 and 31. Members 30, 31 and 32 form a tilting extension, which serves as a support for the cradle when in upright position and as a lever to tilt the cradle when the boat is to be lowered.

Various means may be used to operate the davit construction just described, and we have shown herein a mechanism for operating thesame, but as th s fo ms; imp of our invention, we do not limit ourselves thereto. The mechanism shown is merely for illustrative purposes. V

' The top of post 20 is formed with teeth on its periphery as indicated by 33in Fig.

3. The teeth do not extend entirely arouml the'post, but form in effect a mutilated gear. The post in tubular member 15 is of the same construction. of the vessel is a spur gear 34 meshing with the teeth 33. Secured to the spur gear 34 is a bevel gear 35. Meshingwith bevel gear 35 is a bevel pinion 36, which is fixed to a shaft 37 mounted in bearings on the deck of the vessel. The shaft 37 is Operated by a motor 38. A similar set of gearing is operated from the shaft to move the post in tubular member 15. Upon operation of the motor- 38, the shaft 37 will be rotated, there-- by turning the posts in the tubular membe'rs 14 and 15 until the brackets 10 and 11 have been swung outwardly. After the brackets have reached a position at right angles to the side of they boat, the teeth on the end of the post will have been moved 1 so that they no longer mesh with their respective spur gears, and the shaft 37 can continue to rotate without interference. When the brackets 10 and 11 are in open position they may slide downwardly in the tubular members 14 and 15; They are however held in their upper position by means o f cablesj39 and40.

i As the cables areduplicates, only one will bedescribed, Qable40 is led over a sheave 41, and the. free end'thereof is secured to the top ofthe post in tubular member 15. Cables 39 and; 40 are wound upon drums 42 and 43, which are fixed to a shaft 44. Botatably mounted upon shaft 44 is a spur gear 45 provided with a clutch member. Spur gear 45 meshes with a pinion46 fixed to shaft37. Splinedupon shaft 44 is a clutch member 47 adapted to clutch the gear 45 to the shaft 44. A suitable lever and link age indicated by 48 is arranged to operate the clutch member 47. Fixed to shaft 44 is a brake drum 49, whichis operated bya lever in the stand'oflevers 50. It is obvious that after the brackets have been swung into open position, the; dr-ums42 and 43 m ay be' allowed to rotate, therebylower.-

ing the brackets by means ofthecables 39 and 49. The clutch drum 49 with its cor respondingjleyersjcontrols the movement of Shaft- 44 when itiisf-reeifrom the gearing.

Ijn [mesh with, thegear 45' is a gear 51.

' Splinedtdshaft 52,1to', which gear 51 s ed; lu ch mem .3 imed t engage a"cOrrespo'I 1Cling" clutch member secured to. drum54. Drum 54is' rotatably mounted uponshaft 52. A brake drum 55 is, fixedto'the drum 54 for controllingthe same, and is operated by an appropriate lever in the stand '50. Wound upon drum Mounted. upon the deck v9 Il 16Qted to the cross piece 29 on the cradle.

This drumoand cable are operated to pull the cradle into upright position. A shaft 57 is geared to gear 51 by gearing 58. Splined upon shaft 57 is a clutch member 59, adapted to engage a corresponding clutch member secured to the drum 60. 'Drum 60 is journaled' upon the shaft 57 and is provided with a brake drum 61, which is controlled by appropriate linkage connected to a lever in the stand 50. Wound upon the-drum 60 is a cable 62, which is secured to the cross piece 32 on the tilting portion of the cradle.

After the brackets 10 and 11 have been swung into open position as shown in Fig. 4, the drums 42 and 43 are operated to permit the brackets to move into their lower position asshown in Fig. 5. The drum .60 is then operated to wind cable 62 thereon and thereby tilt'the cradle into position shown in Fig. 5. The cable 56 is permitted to unwind from the drum 54, thereby permitting the cradle to swing into its open position shown in Fig. 6. In this position the lifeboat 13 may be released.

To hoist the life boat the drum 54 is operated to wind cable 56 thereon and-bring the cradle into upright position. The drums the vessel; The-fingerson the bracket'sireada ily'slideinto; the notches OnQthe tubular members due to the beveled" edges of: the latter. The davit' construction is nowin the'position shown in'Fig. 2, and again ready for operation.

If there are a number of decks upon the vessel, the tubularmembers 14 and 15 may be made long enough, so that after the brackets are swung outwardly the boatmay be lowered to the level of any deck and then filled with passengers by using a gang plank or other suitable means for reaching the boat from the deck. 1

To securelyhold the brackets in their open position cables 63 and 64 may be employed, these being attached to the side of the cradle and fastened to suitable hooks upon the side of the vessel as shown in Fig.7.-

What we claimis-j:

1 In a, davit constructiom'the combination of brackets secured "to" a vessel for v is h nwa dl a adle a a te to support a boat mounted upon saidb'rack; ets fortiltingoutwardly.

"2. I a davit, con'st Hcti m the cOmbinaiextension.

' s: In a da'vit mm-ass, the combination of brackets, means securing said brackets to a vessel for swinging outwardly and for sliding movement toward and from the water, and a cradle adapted to support a boat mounted upon said brackets for tilting outwardly.

4. In a davit construction, the combination of brackets, means securing said. brackets to a vessel for swinging outwardly and for sliding'movement toward and from the water, and a cradle adapted to support a boat mounted upon said brackets for tilting outwardly, said cradle having a tilting extension.

5. In a davit construction, the combination of brackets, tubular supporting members secured to a vessel, said tubular members being slit longitudinally and provided with notches, posts ournaled in said tubular member, said brackets being secured to said &

posts by fingers adapted to register with said notches when the brackets are in their upper position, and a cradle adapted to support a boat mounted upon said brackets for tilting outwardly.

6. In a davit construction, the combination f brackets, tubular supporting members secured to a vessel, said tubular members being slit longitudinally and provided with notches, posts journaled in said tubular member, said brackets being secured to said posts by fingers adapted to register with said notches when the brackets are in their upper position, and a cradle adapted to support a boat mounted upon said brackets for tilting outwardly, said cradle having a tilting extension.

WILLIAM G. SEERS. FREDERICK W. NEW.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of yatenta, Washington, D. G. 

